Sony Ericsson GTR-64 manual RS232 Serial Port, Pin Signal Dir Voltage Description Levels

GTR64 http://www.matrix.es/GTR64

3.6 RS232 Serial Port

The modem supports a standard RS232 serial interface (EIA/TIA 574) via its 9 pin Sub-D connector, shown below. In line with serial communication terminology the GTR64 serial modem should be considered as the data circuit-terminating equipment (DCE) and the external application or computer as the data terminating equipment (DTE).

The electrical characteristics of the serial port signals are shown below:

Pin	Signal		Dir	Voltage	Description
				levels
1	DCD		O	> +4V	Data carrier detect
				< –4V
2	RD		O	> +4V	Received data
				< –4V
3	TD	I		> 2V	Transmitted data
				< 0.8V
4	DTR		I	> 2V	Data terminal ready
				< 0.8V
5	GND	-		0V	Ground connection
6	DSR		O	> +4V	Data set ready
				< –4V
7	RTS	I		> 2V	Request to send
				< 0.8V
8	CTS		O	> +4V	Clear to send
				< –4V
9	RI		O	> +4V	Ring indicator
				< –4V

GTR64 Integrators Manual V.1.2 Pag. 17 Preliminary. Subject to change without prior notice